Long ago, the CLA and other US intelligence officials concluded that Bin Laden _____ the day –today leader of the terrorist organization he founded over 10 years ago.

A．was stopped being

B．had stopped to be

C．have stopped being

D．had stopped being

英国科学家波普尔说：“如果我们过于爽快的承认失败，就可能使自己发掘不了我们多么接近正确。”这句话告诉我们（）

①辩证否定是事物之间的相互否定

②事物发展是前进性与曲折性的统一

③矛盾双方在一定条件下相互转化

④真理是主观性和相对性的辩证统一

A.①③

B.①④

C.②③

D.③④